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Book Looks at Inventors and Obscure Geniuses

NPR | By Steve Inskeep

Published November 5, 2004 at 12:00 AM EST

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Historian Harold Evans talks about great inventions by Americans. Evans' book, They Made America, profiles well-known inventors, and some obscure geniuses — the inventors of the gas mask, the credit rating and the retail franchise. Hear Evans and NPR's Steve Inskeep.